Make Your Resume Now

Backend Developer (Java / Enterprise Systems)

Posted November 26, 2025
Full-time Mid-Senior level

Job Overview

At Uni Systems, we are working towards turning digital visions into reality. We are continuously growing and we are looking for a Backend Developer (Java / Enterprise Systems) to join our UniQue team in Brussels!

What will you be doing in this role?

  • Development of back-end website applications
  • Integration of user-facing elements developed by a front-end developer with server-side logic
  • Implement core business logic
  • Creation of servers and databases for functionality
  • Design and implementation of data storage solutions
  • Understanding and implementation of security and data protection
  • Optimization of the application for maximum speed and scalability
  • Design and develop APIs
  • Participating in the design and creation of scalable software
  • Taking lead on projects, as needed
  • Maintenance of code integrity and organisation
  • Writing clean, functional code on the back end
  • Compile and analyse data, processes, and codes to troubleshoot problems and identify areas for improvement
  • Testing and fixing bugs or other coding issues
  • Meet both technical and consumer needs
  • Write technical documentation

Requirements

What you need to succeed in this position:

  • BSc degree in IT and at least 11 years of experience, or MSc degree and minimum 7 years experience
  • Proficiency in backend development using Java8+, including Spring, Spring Boot, Hibernate and Java EE
  • Experience with REST APIs and SOAP Webservices
  • Experience with Oracle DB and RDBMS technologies such as Oracle
  • Familiarity with NoSQL databases (plus)
  • Knowledge of frontend technologies: JavaScript, TypeScript, HTML, CSS and Angular (plus)
  • Experience with messaging systems such as JMS, Kafka and ActiveMQ
  • Knowledge of development, building and deployment of microservices
  • Experience with OpenID Connect integration and SSO
  • Knowledge of API Gateway configuration with OAuth 2
  • Knowledge of SSL/TLS Protocol configuration in application servers
  • Knowledge of reverse proxy configuration
  • Experience with Oracle WebLogic Server, including configuring domains, deploying and running applications
  • Knowledge of Apache and Nginx
  • Experience in Cloud development using Amazon Web Services (AWS)
  • Knowledge of containerization technologies such as Docker
  • Familiarity with container orchestration tools such as Kubernetes (plus)
  • Knowledge of CI/CD pipelines and Continuous Integration & Deployment tools such as Bamboo
  • Experience with code versioning tools such as Git
  • Experience with web services testing tools: SOAPUI, ReadyAPI and Postman
  • Ability to understand, speak and write English at level B1 is mandatory. French at B1 would be an asset

At Uni Systems, we are providing equal employment opportunities and banning any form of discrimination on grounds of gender, religion, race, color, nationality, disability, social class, political beliefs, age, marital status, sexual orientation or any other characteristics. Take a look at our Diversity, Equality & Inclusion Policy for more information.

Ready to Apply?

Take the next step in your career journey

Stand out with a professional resume tailored for this role

Build Your Resume – It’s Free!